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Oxidation of Metals

, Volume 68, Issue 5–6, pp 253–269 | Cite as

In-situ Impedence Spectroscopy Study of Electrical Conductivity and Ionic Transport in Thermally Grown Oxide Scales on a Commercial FeCrAl Alloy

  • J. Öijerholm
  • J. Pan
  • Q. Lu
  • C. Leygraf
Original Paper

Abstract

In-situ impedance-spectroscopy measurements were performed at temperatures between 600 and 1,000 °C to investigate ionic transport in oxide scales formed on Kanthal AF alloy. The samples were pre-oxidized at 800, 900 and 1,000 °C in air. The impedance spectra of the oxide formed at 1,000 °C exhibited essentially one semicircle, whereas samples oxidized at lower temperatures showed an additional semicircle at high frequencies suggesting a more heterogeneous oxide. The ionic-transference number, derived by measuring the voltage across the oxide scale, indicates that the oxide is a predominant electronic conductor. Ionic diffusivity in the oxide scales formed at different pre-oxidizing temperatures was calculated, using the ionic-transference number. The ionic diffusivities obtained in this way are in reasonable agreement with literature data acquired by other methods. The oxide-formation temperature has a significant influence on the conductivity and ionic-transport properties of the oxide scale.

Keywords

Alumina scale FeCrAl alloy Impedance spectroscopy Conductivity Ionic diffusivity 

Notes

Acknowledgment

Kanthal AB and The Swedish Competence Centre for High Temperature Corrosion are greatly acknowledged for the financial support to this work.

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  1. 1.Division of Corrosion Science, Department of Chemistry and EngineeringRoyal Institute of TechnologyStockholmSweden
  2. 2.Kanthal ABHallstahammarSweden
  3. 3.Division of Corrosion Science, Department of Materials Science and EngineeringRoyal Institute of TechnologyStockholmSweden

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